Replacement for 644275-B21: Drop-In Alternatives We Stock
Looking for a replacement for the 644275-B21 (644275-B21 - HP Microsoft Windows Small Business Server 2011 Premium Add-on License Standard 5 Device CAL PC English, French, Italian, German, Spanish)? Pro Disk Network ships HP drop-in replacements and equivalent modern parts from US inventory. Every alternate below is in-stock today with same-day shipping for orders placed before 2pm ET. If your unit is still under warranty, contact our engineering team — we offer cross-shipping for B2B customers on Net 30 terms.
About the 644275-B21
| SKU | 644275-B21 |
|---|---|
| Product | 644275-B21 - HP Microsoft Windows Small Business Server 2011 Premium Add-on License Standard 5 Device CAL PC English, French, Italian, German, Spanish |
| Stock status | In Stock |
| Detail page | View 644275-B21 › |
Drop-in replacements for 644275-B21
Each part below is currently in our US warehouse, ships same-day for orders before 2pm ET, and includes our 90-day warranty. SKUs link to the full product page with photos, datasheets and B2B quote form.
J9666A - HP Procurve Advanced Services ZL Module with Microsoft Windows Server 2008 R2 Standard
SKU: J9666A
Price: $1,043.37
JG587A - HP MSR Small Survivable Branch Communication MIM Module powered by Microsoft Lync
SKU: JG587A
Price: $1,394.74
730214-019 - HP 14-inch SATA Straight End to Right Angle Cable for ProDesk 400 G1 Small Form Factor Business PC
SKU: 730214-019
Price: $121.05
A7452A - HP StorageWorks MSA1000 for Small Business High Availability Kit
SKU: A7452A
Price: $9,151.24
HP SN962UC#ABA-C3-07 Desktop Workstation - Z210 Xeon E3 Quad-Core 3.30GHz Bus Speed 5.00GT/s 8 MB Cache RAM 8GB 160GB SATA No Optical Local Area Network Capable Microsoft Windows 7 Professional (32-bit) License Only - No OS Installed U.S. English Tower
SKU: SN962UC-ABA-C3-07
Price: $420.25
325526-001 - HP Mini PCI 54G WiFi 802.11b/g Wireless LAN (WLAN) Network Interface Card for Business Nc4000/ Business Nc4000.
SKU: 325526-001
Price: $78.00
486295-001 - HP Battery (primary)for Business 6530b/ Business 6535b Notebook PCs
SKU: 486295-001
Price: $363.03
878364-B21 - HP Premium NVMe 6SFF / 8SFF Bay Kit for ProLiant DL580 Server
SKU: 878364-B21
Price: $630.54
867960-B21 - HP ProLiant DL360 G10 Configure-To-Order (CTO) Premium 10 NVMe Server
SKU: 867960-B21
Price: $1,426.32
867158-B21 - HP Apollo r2600 24 SFF Premium Gen10 Configure-to-Order Chassis Server
SKU: 867158-B21
Price: $3,683.97
How we pick replacements
Every recommendation above was selected using these criteria:
- Drop-in compatibility — same form factor (2.5"/3.5", PCIe slot, SFP port, etc.), so it fits the original chassis without modification
- Equivalent or better performance — matched on RPM/IOPS/speed/throughput, never downgraded
- Same-brand-preferred — we list the OEM-equivalent first when available, then trusted aftermarket
- Warranty coverage — 90-day Pro Disk warranty on every part, with 1-year option for B2B
- In stock today — never recommend a part that is on backorder
Need help confirming compatibility?
Our engineers validate every replacement against your specific server, switch, or chassis model before shipment. Email sales@prodisknetwork.com with your platform model (e.g., Dell PowerEdge R740, HP DL380 Gen10, Cisco Catalyst 9300) and we will confirm the exact part number that drops into your hardware.