Add a domain to the Tennant Allow/Block Lists in Microsoft 365 using PowerShell
Add a sender or domain to the Microsoft 365 Tenant Allow/Block Lists with PowerShell when Defender for Office 365 wrongly blocks legitimate mail as phishing.
Read post →Our thinking
Blog
Technical notes and observations from years of supporting creative businesses on Mac.
Search the blog
Force Spotlight to rebuild search indexes
Rebuild Spotlight indexes on macOS when Mail and search stop working, using mdutil on the APFS Data volume or the Search Privacy reset method.
Read post →Automatica Corporate ID Refresh
Automatica refreshes its corporate identity for 2025, keeping the orange and grey palette while adding the Sandler script font and a reworked gear icon.
Read post →Check APC UPS Warranty Status and Build Date
Check an APC UPS warranty status using the serial number on the UPS Lifecycle lookup tool, and decode the build date embedded in the serial.
Read post →macOS High Sierra Internet Recovery Error: “The Recovery Server Could Not Be Contacted”
Fix the "Recovery Server Could Not Be Contacted" error in macOS High Sierra Internet Recovery on a wiped Mac that won't boot external installers.
Read post →Automate LetsEncrypt certbot SSL certificate renewal on macOS
Cron is deprecated on macOS, so schedule automatic Let's Encrypt certbot certificate renewal with a launchd Launch Daemon plist instead, with full setup steps.
Read post →Display most recently modified files in a folder, and all subfolders, using Terminal
List the most recently modified files across a folder and all its subfolders with a single macOS Terminal command using find, stat, sort and head.
Read post →Fix issues wth Out of Office (OOF) rules on Microsoft 365
Fix misbehaving Out of Office replies in Microsoft 365 by toggling the auto-reply state and removing the hidden OOF inbox rules via Exchange Online PowerShell.
Read post →Universal Print Drivers for Windows 11 arm64
x64 print drivers won't run on Windows 11 arm64. Snapdragon PCs need arm64 drivers, with universal driver links for Xerox, HP, Konica Minolta and Lexmark.
Read post →Create a Bootable Windows 11 Installer USB with Autopilot Configuration for Zero-Touch Enrolment in Intune
Build a bootable Windows 11 USB with an Autopilot profile baked into install.wim using DISM, PowerShell and Rufus for zero-touch Intune enrolment.
Read post →Print to Fuji Xerox / Fujifilm printers from Windows 11 on ARM64 / Snapdragon
Fuji Xerox and Fujifilm printers have no arm64 drivers for Windows 11 on Snapdragon, but the Xerox Global Print Driver V3 in PCL6 or PostScript works instead.
Read post →Upgraded from Windows 11 Home to Windows 11 Pro via Microsoft Store. Ended up with Windows 11 Enterprise that wouldn't activate.
A Microsoft Store upgrade left Windows 11 stuck on unactivated Enterprise. Entering the generic Pro product key in Settings reverts it to activated Pro.
Read post →Force Spotlight to rebuild search index on macOS Sonoma and later
Reset and rebuild the Spotlight search index across all volumes on macOS Sonoma and later with mdutil and launchctl when search or Privacy List errors appear.
Read post →Unable to install Microsoft Print to PDF printer on Windows 11 24H2 - Error 0x800F0922
Microsoft Print to PDF won't install on Windows 11 24H2 (error 0x800F0922) due to a missing prnms009.inf driver. Installing KB5043080 then KB5043178 fixes it.
Read post →Recover password for Mac saved in Apple Remote Desktop
Recover saved Mac usernames and passwords stored in Apple Remote Desktop using the ARD Inspector tool and the master password from your Keychain.
Read post →Change 3CX System Owner via ssh on v20
Locked out of a migrated 3CX v20 instance, change the system owner email directly in the database_single Postgres database over SSH, then reset the password.
Read post →Work out temporary Apple ID after enabling Federation in Apple Business Manager (ABM)
After enabling federation in Apple Business Manager, work out the temporary Apple ID format to log in and turn off Activation Lock on a locked Mac.
Read post →Unzip multiple zip files with unicode filenames inside the archive
macOS unzip mangles unicode filenames from Google Takeout archives. Use ditto in a shell loop to batch extract zips with non-ASCII characters intact.
Read post →Sort Firefox Containers Alphabetically
Sort Firefox containers alphabetically by quitting Firefox and running jq over containers.json to reorder the identities array by name, with no manual editing.
Read post →Flatten fillable PDF Form from Acrobat on macOS
Acrobat on macOS won't flatten a fillable PDF and blocks print to PDF. Installing the free RWTS PDFwriter printer lets you print a properly flattened PDF.
Read post →