Some big moves in October eclipsed even the run of notable IT executive moves from September, and included some big changes at marquee tech companies like Apple, Symantec, EMC, Cisco, Juniper and VMware. Here's a look at some of the notables.

In one of the biggest executive shake-ups at Apple in ages -- and the first major realignment since Tim Cook succeeded the late Steve Jobs as CEO -- Scott Forstall, the head of Apple's iOS software unit, departed the company in late October. Forstall was said to have disagreed with Cook and other Apple managers over the handling of its faulty Maps app in iOS 6.

Another major ouster from Apple happened at the same time: John Browett, brought in six months ago to head Apple's retail operations, was asked to leave after he "failed to fit in," according to reports.

Microsoft's loss was VMware's gain in the case of Jonathan Chadwick, who in mid-October joined VMware as CFO. Chadwick, who was a corporate vice president of Microsoft and CFO of Skype and previously held executive and financial roles at McAfee and Cisco, succeeded Mark Peek, who left VMware in June.

John Chen had managed Sybase for 15 years and continued to lead the company after its 2010 acquisition by SAP. But in late October, Chen's time with Sybase came to a close because, according to a statement, it was "time to take on a new challenge."

It's been a year of significant shake-up for security software and storage giant Symantec, which replaced CEO Enrique Salem with new CEO Steve Bennett over the summer. Among the latest changes to Symantec's executive team since Bennett's ascent was the ouster of William Robbins, executive vice president of worldwide sales. Symantec plans to reorganize its sales teams into regional groups, each reporting to Bennett, rather than name a new global sales boss.

Barracuda Networks has a new leader in B.J. Jenkins, a longtime EMC executive who was most recently president of the storage giant's backup and recovery systems division. Barracuda, which specializes in email and web security appliances as well as application delivery and data protection, had been without a CEO since the July resignation of former chief executive Dean Drako.

John Roese was a public face of Huawei's efforts to expand into North America, but in early October, Roese jumped ship to EMC, where he is now chief technology officer. Roese's Huawei title was senior vice president and general manager, Huawei North American R&D. Earlier in his career, he held CTO roles at Nortel, Broadcom, Enterasys and Cabletron.

It's hard to say exactly what's ailing Juniper, but the company's significant restructuring -- intended to remove at least $150 million in expense during its next year -- has also seen a planned parting of ways with four EVP-level executives in the last months. Transitioning out of Juniper are Stefan Dyckerhoff (pictured), EVP, platform systems division, Mark Bauhaus, EVP, service, support and operations, John Morris, EVP, strategic alliances, and R.K. Anand, EVP and general manager, data center.

Channel bigwig Insight Enterprises added a new manager at the top: Steve Dodenhoff, who in early October became president of the company's U.S. operations right under Ken Lamneck, president and CEO. Dodenhoff joined Insight in January as senior vice president of human resources and business development, and was previously at Enghouse Interactive, Integrated Information Systems and MicroAge.

Ari Jaaksi's cut an interesting path in the last few years, having transitioned from Nokia, where he'd spent 12 years and most recently led software, hardware and user experience, to HP, where he was senior vice president of WebOS software and services. Jaaksi's latest port of call, however, is McAfee, where in October he was named SVP and general manager, Mobile Engineering and Operations.

Onward and upward for Jai Menon, well known as an IBM fellow and CTO, who exited Big Blue in the summertime but only recently began to make public his move to become CTO for Dell's Enterprise Solutions Business. Menon is one of several major recent executive additions for Dell, which is continuing to remake its executive team with veterans from other large tech companies.

You had to think that when Marissa Mayer took over as CEO of Yahoo, she'd be able to lure a couple of her former Google colleagues over to help right the Yahoo ship. One of the biggest names so far is Henrique De Castro, named Yahoo's chief operating officer in mid-October. De Castro had most recently been Google's president, partners business solutions, but according to regulatory filings, stands to make up to $56 million in compensation at Yahoo.

It hasn't always been the smoothest of rides for electronics manufacturer Jabil Circuit, but there have been accolades aplenty for Timothy Main, who's spent a quarter-century at the company and the last 12 years as president and CEO. Jabil Circuit in mid-October confirmed that Main will vacate the post on March 1, 2013, and hand the CEO reins to Mark Mondello, current COO.

"Troubled" is one way to describe Progress Software, which is cutting head count, divesting business lines and looking to restructure operations in an effort to turn itself around. In early October came word that Jay Bhatt would step down as Progress' president and CEO in December.

Another week, another WebOS-related exit from troubled tech giant HP. Sam Greenblatt was CTO of the WebOS business HP acquired with Palm until March, when he took a new role as general manager, Critical Systems Management Unit. In mid-October, he was gone from HP entirely, having moved on to Dell as chief technical evangelist for Dell's Enterprise Solutions Group.

Well-known IBM executive Frank Kern, who retired from Big Blue as head of consulting and systems integration earlier in 2012, was named CEO of Aricent Group, the tech consultancy controlled by Kohlberg Kravis & Roberts and other investment firms. Kern succeeded Sudip Nandy, who moved into a new role as chairman of Aricent's India business.

Nancy Reynolds has moved around the channel plenty in recent years, and in October, exited Kaspersky Lab, where she'd been senior vice president, corporate sales. Before joining Kaspersky in 2010, Reynolds had been enterprise channel chief at Dell, the first channel chief at then-fledgling Palo Alto Networks, and also spent five years in channel roles at Trend Micro.

Amanda Jobbins was much admired by Cisco partners during her year running Cisco's global partner marketing, but opted to leave Cisco and return to her native U.K. back in August. Early in October, Jobbins surfaced as the new chief marketing officer at enterprise software stalwart The Sage Group plc, responsible for managing Sage's global brand, strategic product marketing, pricing, corporate communications and global alliances.

Ken Bast spent 15 years at Ingram Micro and ran, among other practices, its lucrative Cisco business. In late October, however, Bast exited to become senior vice president, global field operations and channels at cloud service management start-up FireScope. Bast's most recent role at Ingram was as vice president and general manager, Advanced Technology Division. Ingram has replaced him in the role with another 15-year Ingram vet, Jay Miley, most recently managing director of Ingram Micro Australia.

Arista Networks' executive team is well stocked with Silicon Valley veterans, and it added two more in early October with the appointments of Michael Lehman as CFO and Tom Black as vice president, SDN engineering. Lehman, a 30-year veteran, spent two decades at Sun Microsystems and was also Palo Alto Networks' first CFO. Black was a key piece of Cisco's SDN strategy, having most recently run Cisco's ONE initiatives and also headed engineering for Cisco's WAN optimization business.

Nice little coup for Brocade: David Meyer, a Cisco technologist and distinguished engineer known for his work in OpenFlow and SDN, joined Brocade as chief scientist and CTO of its service provider business in mid-October. Meyer's purview will be tier-one service providers, cloud hosting providers and Web 2.0 content providers, and he'll also be tasked with evangelizing Brocade's approaches to Ethernet fabric, advanced routing and the SDN trend.

Cisco's been adding to its security talent pool with some big-name executives lately, and in early October, picked up 30-year veteran Bret Hartman as its new CTO, Security Technology Group. Hartman was most recently CTO at RSA, the security division of EMC.

Fast-rising cloud collaboration start-up FuzeBox continues to fatten up its roster of executives and also of industry investors. Fresh off a $20 million Series A infusion a few months ago, FuzeBox in October brought on Michael Knappe, a founder of the VoIP Forum Industry Consortium and regarded as a pioneer in the VoIP industry, as director of engineering.

As wireless and cloud networking companies go, Aerohive's been on the up-and-up for some time now, and has continued to add key executives to speed its worldwide commercial growth plans. Among recent hires was Dean Hickman Smith, most recently SVP of worldwide sales at email security player Proofpoint, who became Aerohive's senior vice president of worldwide sales. Also new to Aerohive is Raphael Gernez, vice president of operations, who joined the company following stints at SunPower, Plastic Logic and HP.

Another big exit from VMware: Vittorio Viarengo, vice president of product marketing for the virtualization powerhouse's End User Computing division, left the company in mid-October after a three-and-a-half year run. Viarengo, at presstime, was believed to be headed for a start-up.

Right at the end of September, MSP stalwart N-able Technolgies made some significant promotions. Mike Cullen, N-able's channel chief and sales leader, became senior vice president of worldwide sales. And Frank Coletti, director of sales, became vice president of sales.

It's been a boffo year at cloud-focused solution provider Cloud Sherpas, which celebrated its recent momentum with two mid-October executive announcements. Chris Arroyo, most recently vice president and CFO at systems integrator Capgemini, joined Cloud Sherpas as CFO, and Gary Diorio, also from Capgemini, took over Cloud Sherpas' Salesforce.com business. Cloud Sherpas is projecting 2012 revenue of $45 million, more than double its 2011 take, and now has more than 2,500 clients, according to the company.

An unexpected, but perhaps not all that surprising exit from the Cisco channel ranks: Geoff Fancher, who came up as a Cisco account manager starting in 1995 and became vice president of Cisco's U.S. field partner organization a few years ago, left Cisco to become senior vice president of U.S. sales for Comstor, the Cisco business unit of distributor Westcon Group. Fancher's P&L responsibility includes some $700 million in Westcon revenue.

It's been an interesting few years for Jeff Valentine, who's twice had companies he's worked at acquired in the last three years, and has since moved on once more. Valentine, who was most recently product vice president in ShoreTel's Cloud Division, left ShoreTel to become senior vice president of corporate development at UC rival Fonality. Valentine had joined ShoreTel following its acquisition of M5 Networks back in the spring. M5, in turn, had gobbled up Valentine's former company, Callfinity, in 2011.

IPv4 and IPv6 network and infrastructure automation is becoming a big business, and 6Connect, a three-year-old company, is an emerging player in that arena getting some stellar notices. That's probably what helped lure Bill Bien, a 20-year industry veteran with stints at People Power, Telstra and Cisco on his resume, to become CEO, where he'll serve alongside 6Connect President and CTO Aaron Hughes.

As vice president of marketing at solution provider Force 3, Krissy Kelley was a fixture at industry events, particularly those of major Force 3 partners like Cisco and get-togethers concerning the federal government, whose agencies are Force 3's primary customers. Kelley has since gone on from Force 3, having become a public sector-focused regional marketing manager at Citrix.

The Revolving IT Door:
30 Notable IT Executive Moves: September 2012
30 Notable IT Executive Moves: August 2012
30 Major Channel Chief Changes In 2012