Utilize the input text as a context reference, choose the right relationship between Office 365 and Microsoft from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

We continue to effectively demonstrate the strength of Proofpoint's products when compared to the baseline security solutions provided by Microsoft as part of their Office 365 bundles.

Answer: developer