Outlook is not updating automatically
When the error occurs, mail in the Outbox also doesn't get sent until Outlook is restarted.You have two options to avoid this problem: either disable the Download Public Folder Favorites option, or keep the number of cached public folders favorites under 1,000 (or low enough to avoid the error message.) .To create and use email signatures in Outlook on the web, see Create and add an email signature in or Outlook on the web.Do you have feedback on creating or using Outlook signatures? In particular, if you had trouble locating the Signatures menu, we'd like to know where you expected to find the option to create a signature.You can typically reduce the number of public folder favorites by deleting them by using the Outlook client.
Digest Authentication also works through a proxy server unlike Integrated Authentication.In most cases, you won't have a problem until you exceed approximately 1,000 folders, or a gigabyte of space is used.Outlook works fine for a little bit (5-10 minutes) before users start getting this error: Task 'Microsoft Exchange' reported error (0x8007000E) : 'Out of memory or system resources. There is not enough memory available to perform the operation.Because of this you should explicitly configure the authentication methods the way that you intend them to be set, rather than modifying only a single authentication method.In this example the Exchange Server 2010 OWA virtual directory is being configured for Forms-Based Authentication.
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Forms-Based Authentication – this method uses a sign-in webpage on the server to collect logon credentials.