ActiveSync certificate problems are well known to the Windows Mobile community. If you have certificate problems on Windows mobile 2003, you could disable certificate checking using disablecertchk.exe, but this does not work on WM5 and you have to export the certificate and install it on the device to get around the 0x80072F0D problem:

If you are the Exchange administrator for your domain and you have several hundred devices to configure, instead of visiting each device to install the certificate, you could prevent this problem by installing a certificate on the OMA-ActiveSync website that is already in the root store.

This can be found in Start > Settings > Certificates:

Installing a certificate from any of the vendors in this list will avoid the problem described above. They may cost you 20 bucks $150 more than your normal provider, but it could be worth the money if it saves you hours of hassle and extra work.

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