Yes, there is a way to capture passwords so that users can keep their old passwords.

First, you'll have to make sure that all users have been imported into ActiveCampaign and assigned all the necessary tags, etc.

In the designated password field (default is "Password") in ActiveCampaign, assign the following value: #$mbr$capture$#

After that, as your users attempt to login, the passwords they enter will be verfied and, if correct, stored in ActiveCampaign.