Almost no market
Edge mail merge barely exists. GMass has only 1,620 installs, roughly 0.5% of its Chrome base. The drop reflects how Edge users handle bulk email: web-based platforms or Outlook's native mail merge inside Microsoft 365. The whole category contains just two extensions, which is close to zero organic demand next to Chrome.
A bare landscape
GMass leads at 1.6K installs with a perfect 5 stars on a single review, followed by Mail Merge for Microsoft 365™ at 39 installs with no reviews and no rating. One review across both extensions tells you very little: the tools look abandoned, deployed by corporate mandate with no organic uptake, or uninstalled fast in favor of Microsoft 365's native option. Mail Merge for Microsoft 365™ targets the Microsoft ecosystem directly and still draws only 39 installs, a sign users prefer Outlook's built-in mail merge to a browser extension.
No quality data
There is no meaningful quality data here. GMass's 5-star rating rests on one review, which says nothing about real satisfaction. Mail Merge for Microsoft 365™ has zero reviews, whether from a recent launch, no discovery, or quick abandonment. Negligible installs and no review momentum mean users either never find these extensions on Edge or drop them immediately for Outlook's native capabilities and Power Automate.
No real upside
This category offers essentially no commercial opportunity because Microsoft owns the workflow. Outlook's built-in mail merge, Power Automate, and enterprise platforms like Exchange Server and Dynamics 365 remove the need for an extension among Edge users, who mostly live inside Microsoft's suite. GMass dropping from 300K installs on Chrome to 1.6K on Edge, a 99.5% decline, shows the barrier. Discovery is nonexistent, and even 100 to 500 installs would be exceptional while generating no revenue. The realistic move is to leave browser extensions behind for Microsoft 365 add-ins, Power Automate connectors, or Outlook plugins that integrate natively.