The easiest way to go is to forward all email accounts to one main account. Depending on your situation this would be a start. Go to your non web based online email server for that part.
I understand that it is possible to consolidate numerous webmail accounts from assorted providers via one provider and a single email/webmail account.
However, is this also possible w/ a (non-webmail) email client?
If so, how is this done?