The word “supported” can mean different things in different scenarios, but for this article it means: Deploying updates carries risk.
Microsoft has released updates in the past that introduced new bugs, but there is also the risk that something unique to your environment will cause an unexpected issue.
Outlook 2011 does not use Exchange Cached mode and directly connects to the Global Address Book (GAL) via LDAP connection.
In this case your global address book will update each time Send/Receive is pressed.
So try to clear the offline items by following these steps: Resolution 2: Delete OST Files Outlook caches and stores email messages, calendar events and other items in Offline Storage Table (.ost) file.
Maintaining your Exchange Servers with the latest updates is the best practice.
The new contents such as emails, contacts, calendar items, tasks, notes and others are not updated and not downloaded even though user manually select “update folder” in order to pull the new data.
When the items in Outlook is mismatched with online version, the cached items may be corrupted.San Francisco — April 16, 2009 — Cloudmark, Inc., the global leader in carrier-grade messaging security, today announced its work with Microsoft Corporation (NASDAQ: MSFT) to integrate Cloudmark Authority®, the company's flagship messaging anti-abuse platform, into the next generation of Microsoft Forefront Security for Exchange Server.Cloudmark Authority software delivers fast and highly accurate spam, phishing and virus protection and was selected as a critical anti-spam engine.Yesterday, our SSL certificate expired for our mail.Outlook Web Access website.Naturally, this threw an error that the cert was expired when people tried to log in from a web browser, and stopped email traffic in and out on mobile devices.