Just a quick question to see if anyone can give me any direction in or solve the the following problem:

Within the office there are a minority who use Outlook client using IMAP and the rest use Thunderbird on Linux. The people who are using Outlook 2010 are repeated (almost daily) reporting outages of emailing services for hours at a time forcing them to sign in and out etc but the people using Thunderbird do not have any issues what so ever which I assume will rule out an issue with the old mail server we are currently using.

Any help in the matter would be hugely appreciated and of course if I can provide any further information to articulate understanding of the issue then please just ask.

Thanks!