We occasionally have an Outlook client consume all of the bandwidth at a regional site. For these regional sites, their mailboxes (and CAS roles) are back at headquarters and they connect over the WAN. We were at one time using Cached Mode, but had too many problems with it but now we see on our bandwidth gauges about once or twice a month a various user's Outlook client consuming all the bandwidth to the CAS Array at headquarters. We have been investigating this for over a year now and are stumped. When this happens we remote into the employees PC at the regional site and interrogate both the user and the PC looking for some sort of clue as to what changed or is happening on the client causing all the chatter.
It is never the same client and what is the most bizarre is that an employees mailbox may only be 100MB but yet it consumes 3GB (yes Gigabytes) within hours. The only configuration change we made is enabled Outlook Anywhere. I thought this setting went only to the laptops but it appears to be on the desktops as well. However, this should not be used if they are on the LAN, so it is a mute point I guess.
Thank you for your input.
Karl