Camtasia 9/3 and Later
Camtasia (Windows) and Camtasia (Mac) are cross platform compatible. This allows projects created in Camtasia 9/3 to be transferred between Mac and Windows.
However, not all media files and effects work on both platforms. Legacy callouts and captions also are not cross platform compatible. For additional information on cross platform projects please see this support article.
Camtasia Studio 8.4.0 - 8.6.0 and Camtasia for Mac 2.8.0 - 2.10.7
Camtasia on Windows and Mac record to the .TREC format. These .TREC files can be edited on both platforms. For example, you can record a .TREC file on the Windows computer and edit the same recording on a Mac. You can record a .TREC on a Mac and edit it on Windows. View this video for help with moving TREC files from the Mac to Windows.