I have a PC I'm managing that is a little bit older Dell GX620 with 4GB RAM running Win XP Pro 32. XP and office are all service packed up. The problem is that the PC stalls for like 15 seconds or so during random Outlook operations - jumping from folder to folder, dragging messages from folder to folder, etc. It's somewhat hit or miss. This Outlook is setup as a hosted Exchange client. The OST is about 2GB and there are probably 9,000 messages or more in the inbox with problably 50 subfolders underneath that. I know its not recommended to have that many messages in one folder per Microsoft but this same mailbox sync's to another box with Outlook 2007 runs fine on only 2 GB of RAM. The cleints don't hae these performance biottlenecks but they do have smaller OST's. I've cleaned the temp files, defragged, disabled the add-ins, scanned for malware, started Outlook in safe mode, rebuilt the profile, compacted the OST but nothing seems to help. Any ideas how to get the performance back to normal?