Entourage CPU usage near 100% perpetually after free/busy server is contacted

[msnews.microsoft.com]

I need some help with Entourage 10.1.4 and Exchange 2k Standard SP3. On one
user (Identity), and one user only, and on multiple Macs (iMac G4 1GHZ
10.28, G4 Tower 10.28, and G4 Tower 10.32) the CPU usage on the Mac goes up
to 100% hanging the machine so badly it's not usable. The Mac has been fine
for months connected to the Exchange box. No changes to our Exchange server
or the Mac have occured within the past several months with respect to
updates/patches/etc.

As Free/Busy uses OWA for its scheduling information, we took a look at the
IIS logs on our Exchange box. Sure enough, the Mac downloads the
appointments and stores them. After that, we get perpetual 401s with no
sub-code and 416s. (see below). At this point is when Entourage hangs the
workstation. When one tries to quit the app, a dialog box indicates
something to the effect of "network operations are still running-are you
sure etc.?" The IIS log error:

2004-02-11 03:43:03 10.0.0.29 - 10.0.0.4 80 SEARCH
/exchange/username/Calendar/ - 401
Entourage/10.0+(Mac_PowerPC;+DigExt;+TmstmpExt)
2004-02-11 03:43:03 10.0.0.29 DOMAIN\username 10.0.0.4 80 SEARCH
/exchange/username/Calendar/ - 416
Entourage/10.0+(Mac_PowerPC;+DigExt;+TmstmpExt)

Again, this is the only user that has the problem, not the workstation. Has
anyone experienced this or anything like it?

 

[msnews.microsoft.com]

Found the problem! Someone in our organization had attached a 5.2MB PDF to
the meeting request. Once deleted, problem solved. Anyone had a similar
experience?