There is no official Microsoft Office Picture Manager for Mac, as the program was a Windows-exclusive tool discontinued after Office 2010. Any website offering a "new" free download for Mac is likely a third-party risk or malware.
Is "Office Picture Manager" available for Mac? - Microsoft Learn microsoft office picture manager for mac download free new
For Windows users, Picture Manager was a hidden gem. It could batch resize, compress, crop, rotate, and color correct dozens of images in seconds without crashing or demanding a subscription to Adobe Creative Cloud. There is no official Microsoft Office Picture Manager