If you are using Sophos Puremessage and are having problems getting Server-side ActiveSync to work with either your PPC or your Windows Mobile 5 (WM5) device then you might need to do the following:

In the Puremessage console go to Jobs / Exchange Information Store / Databases tab and check Public Store Background Scanning and Private Store Background Scanning. Click the Apply button at the bottom of the console.

I've never been able to get Server-side ActiveSync working since I bought my iPaq a year or so ago, but haven't had time to work out why not. A chance comment by someone in the UKSBSG Yahoo! group put me onto it. Thanks to James and Alexandre!

Since I found this out I've discovered there's a Sophos KB article about it - www.sophos.com/support/knowledgebase/article/3186.html. It's great when you know what to look for isn't it