As I recently was on the verge of hardresetting my rx4240 as it refused to connect to my PC, I think that sharing the following bit of info could save a lot of grief!
Cutting a long story short: Microsoft’s firewall is the one to blame. If all exceptions are blocked via the “no exceptions” checkbox, ActiveSync will recognize devices but will not be able to connect/sync.
The workaround is simple but dangerous – allow exceptions in the firewall settings.
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