We use exchange 2007 sp2 (installed on 2008 server x64) together with outlook 2003/2007 on vista/win7.
I hardly send large attachments so I am not able to tell for how long this problem exists. Problem is, that only very little bandwidth is used when sending attachments (in house). To send 10 MB took about two seconds, now it takes nearly 20 seconds - on each and any computer. There have been no changes at the mail server for a long time, only windows updates. The problem is reproducible even on clients that don't house any other software, only win7 and outlook. The server is definitely not low on resources (CPU/RAM/disk space).
Furthermore I tested accessing shares of that server and it is as fast as expected (nearly 100 MBit).
So my question is:
-has anyone of you seen a performance degrade similar to this?
-what could I do to get more info on what is going wrong?