Cross-forest, same-forest, and cross-premises (O365) migrations are supported.  The Priasoft solution, having been in continuous support for 17+ years, supports nearly every Exchange-to-Exchange scenario, of which Office365’s implementation is also included.
The solution can migrate from the following versions of Microsoft Exchange as a source platform:
2003
2007
2010
2013
2016
The solution can take any of those source version to any of these target versions:
2003
2007
2010
2013
2016
Office 365
Furthermore, we have new support for a data-only migration from Microsoft Office 365 to Microsoft Office 365.
Reach out to our sales team if there are more questions:  sales@priasoft.com