Error 10055 means that Windows has run out of TCP/IP socket buffers because too many connections are open at once.
Things to check if this happens are:
* Is there any other TCP/IP software running on the same PC as VPOP3 - eg a proxy server
* If you are using 'MX Sending' (on the Out Mail tab in VPOP3), then we recommend that you use the latest version of VPOP3 (1.4.0c or later)
* If VPOP3 is running on Windows 95, make sure you have the kernel updates which fixed a resource problem which could cause this error
* If you have a lot of client computers connecting to VPOP3 either make them connect less frequently, or make sure you are running VPOP3 on Windows NT or 2000 as that has less of a limit on the number of available buffers.