HN is a hard place for people who like Microsoft but I'll tell you that a single user Office 365 Business Essentials subscription is a great deal. Along with e-mail you get a terabyte of Sharepoint (OneDrive) storage, online versions of office apps, and Teams. $5/mo. There's an IMAP migration tool. Just turn on IMAP on your Gmail account if it's not already enabled and let the O365/Exchange wizard suck all the e-mail down.