Making the jump from a Windows PC to a Mac is more common than it has ever been, partly because Apple Silicon machines have delivered performance that converts longtime Windows users. But switching operating systems raises a practical question most people only think about after they have already bought the Mac: what happens to all the software you have paid for?
The answer varies by product, and knowing it in advance lets you plan the switch without unpleasant surprises.
Microsoft Office and Microsoft 365: Good News Here
For most people, Microsoft Office is the most important piece of software to consider. The situation is generally favorable.
Microsoft 365 Subscriptions
If you have a Microsoft 365 Personal or Family subscription, you are in the best position. The subscription covers both Windows and macOS. Simply download the Mac versions of Word, Excel, PowerPoint, Outlook, OneNote, and Teams from the App Store or from office.com, sign in with your Microsoft account, and the apps activate automatically against your existing subscription. No additional purchase needed.
One-Time Purchase Retail Licenses (Office 2019, 2021, 2024)
This is where it gets more nuanced. A retail Office license purchased for Windows does not automatically cover the Mac version. Microsoft treats Office for Mac and Office for Windows as separate products. If you purchased a Windows retail key for Office 2021 Home & Student, that key activates the Windows version only.
To use a perpetual Office version on your new Mac, you would need to purchase a Mac-specific license. However, if the cost of a new perpetual license feels steep, this is often a good moment to switch to a Microsoft 365 subscription — which covers both platforms and stays current.
Windows Itself: Cannot Be Transferred
Your Windows license, whether OEM or retail, cannot be used on a Mac. macOS comes pre-installed on every Mac at no charge. If you want to run Windows on a Mac (using Apple's virtualization tools or Parallels Desktop), you would need a separate Windows license for that virtual machine. On Intel Macs, Boot Camp allowed native Windows installation; on Apple Silicon Macs, virtualization software like Parallels Desktop or VMware Fusion handles Windows compatibility.
Adobe Creative Cloud
Adobe's subscription-based Creative Cloud apps are platform-agnostic in terms of licensing. Your subscription covers both Windows and Mac installations. Simply install Adobe Creative Cloud on your Mac, sign in with your Adobe ID, and install the apps you need. Your projects and settings can also be synced through Adobe's cloud services, making the transition relatively smooth.
Adobe's perpetual licenses (older versions like Photoshop CS6 or earlier) are version-and-platform-specific and would not transfer. These are increasingly rare for active users, as Adobe has pushed everyone toward subscriptions.
Antivirus Software
Most major antivirus providers — including Norton, ESET, Bitdefender, and Kaspersky — offer multi-device licenses that cover both Windows and macOS under the same subscription. If you have a multi-device plan, you can simply download the Mac version from your account dashboard and activate it there.
If you have a Windows-only single-device license, you may need to purchase a new Mac-compatible license or upgrade to a multi-device plan. Check your current antivirus account settings to confirm coverage before buying anything new.
Windows-Only Software: The Real Challenge
This is the category that causes the most friction. Many applications simply do not have macOS versions. Common examples include:
- Microsoft Access (no Mac version exists)
- Microsoft Publisher (no Mac version)
- Many specialized industry applications (accounting software, legal practice tools, engineering programs)
- Older games that never received Mac ports
For Windows-only software, your options are:
- Find a Mac alternative: Often the best long-term solution. Many Windows applications have comparable Mac equivalents.
- Run Windows in a virtual machine: Parallels Desktop or VMware Fusion allows you to run Windows alongside macOS. You will need a valid Windows license for the virtual machine. This approach works well for occasional use of Windows-only apps.
- Keep a Windows machine for specific tasks: Some professionals maintain a separate Windows machine for software that genuinely cannot run on Mac or in a VM efficiently.
Cloud-Based Software: Usually Seamless
Software that lives primarily in the browser is unaffected by your operating system switch. SaaS tools like Notion, Trello, Slack, Zoom, Google Workspace apps, and countless others work identically on Mac and Windows through a browser. Your accounts and data are intact; just open the same URL on your new Mac.
Steam and Gaming Platforms
For gamers, the Steam library presents a mixed picture. Steam accounts carry over completely to Mac, but individual game licenses are not platform-universal. A game you purchased as a Windows title may have a Mac version available at no extra charge (many do), or it may be Windows-only. Check each title's Steam page for the supported platforms. The Steam app on Mac also notes which of your library titles have Mac support.
Practical Pre-Switch Checklist
Before finalizing the switch, go through this list:
- List every piece of paid software you use regularly
- Check whether each has a macOS version
- Confirm whether your existing license covers Mac (subscriptions usually do; perpetual licenses often do not)
- Estimate the cost of any software you need to repurchase or replace
- Factor this into the total cost of the Mac purchase decision
Frequently Asked Questions
Can I use my Windows product key to activate Office on a Mac?
Not for perpetual Office versions (2019, 2021, 2024). These keys are platform-specific. Microsoft 365 subscription plans cover both platforms under the same account.
Do I lose my OneDrive storage when I switch to Mac?
No. OneDrive is accessible on Mac through the OneDrive desktop app or the web interface. Your files remain in the cloud and are available on any device.
Is macOS safer than Windows, meaning I do not need antivirus on a Mac?
macOS has strong built-in security, but Macs are not immune to malware. As Mac market share has grown, so has the volume of Mac-targeted threats. A reputable antivirus solution on a Mac provides meaningful additional protection, especially for users who open attachments from unknown senders or install software from varied sources.
Can I transfer my Microsoft 365 license to my Mac after deactivating it on my PC?
You do not need to deactivate it. Microsoft 365 subscriptions allow simultaneous use on up to five devices across both platforms. Your PC and Mac can both use the subscription at the same time up to the device limit.
Conclusion
Switching from PC to Mac is manageable from a software licensing perspective if you plan ahead. Subscription-based software — Microsoft 365, Adobe Creative Cloud, antivirus multi-device plans — generally follows you across platforms. Perpetual licenses for Windows-specific apps require more careful evaluation. Identifying the gaps before you switch lets you budget accurately and avoid the frustration of discovering missing tools after your new Mac has already arrived.
