Delphi Version Features

Feature	Version
& operator for treating keywords as identifiers	Delphi 2006
{$IFEND} directive no longer required to close {$IF} statements: {$ENDIF} can now be used instead.	Delphi XE4
{$LEGACYIFEND} directive	Delphi XE5
{$MESSAGE} directive	Delphi 6
{$WARN} directive	Delphi 7
64 bit compiler	Delphi XE2
Abstract classes	Delphi 2006
Anonymous methods / closures	Delphi 2009
Attributes	Delphi 2010
class constructors / destructors	Delphi 2010
Class data (class var)	Delphi 2006
Class helpers	Delphi 2006
Class properties	Delphi 2005
Custom managed records	Delphi 10.4
delayed keyword (for loading of DLLs)	Delphi 2010
deprecated directive	Delphi 6
deprecated directive with comment	Delphi 2009
DirectoryExists function moved to SysUtils unit from FileCtrl	Delphi 6
Dynamic arrays	Delphi 4
Dynamic array concatenation and addition extensions. Dynamic arrays can be initialised by assigning an array constant, as in DI := [1, 2, 3]; and can be concatenated using code like DI := DI + [1, 2, 3]; or DI := DJ + DK, where DI, DJ & DK are all dynamic integer arrays.	Delphi XE7
EOSError (instead of EWin32Error)	Delphi 6
ExcludeTrailingPathDelimiter function	Delphi 6
Exit with result parameter	Delphi 2009
Final methods	Delphi 2006
Floating point number comparison routines added to Math unit.	Delphi 6
for .. in loops	Delphi 2005
Frames	Delphi 5
Function inlining	Delphi 2005
Generics	Delphi 2009
IInterface	Delphi 6
IncludeTrailingPathDelim function	Delphi 6
Inline variable declarations	Delphi 10.3
inline keyword	Delphi 2005
Inner exceptions	Delphi 2009
Insert and Delete RTL routines can be used with dynamic arrays in a similar way to how they are used with strings.	Delphi XE7
Int8 type	Delphi 2009
Int16 type	Delphi 2009
Int32 type	Delphi 2009
Int64 type	Delphi 4
Interface to object casting	Delphi 2010
library directive	Delphi 6
LongWord type	Delphi 4
Margins and Padding properties on TControl	Delphi 2006
Namespaces [more info]. See also: Unit scope names.	Delphi 2005
Nested constants within classes / records	Delphi 2005
Nested types within classes	Delphi 2005
Operator overloading on records	Delphi 2006
Overloading for functions, procedures and methods	Delphi 4
platform directive	Delphi 6
RaiseLastOSError procedure	Delphi 6
Record Helpers for simple types	Delphi XE3
Records with methods	Delphi 2006
resourcestring statement	Delphi 3
RTTI enhancements	Delphi 2010
SafeLoadLibrary function	Delphi 5
Scoped enumerators (must have type name prefix)	Delphi 2009
Sealed classes	Delphi 2006
static directive for class methods	Delphi 2005
strict private and strict protected visibility specifiers	Delphi 2005
string type is UnicodeString	Delphi 2009
StrUtils unit	Delphi 6
TApplication.MainFormOnTaskbar property	Delphi 2007
TArray type in System unit.	Delphi 2010
TBytes alias for array of Byte	Delphi 2007
Text format form files	Delphi 5
TFormatSettings and overloaded format and conversion routines that use it	Delphi 7
TObject.Equals virtual method	Delphi 2009
TObject.GetHashCode virtual method	Delphi 2009
TObject.ToString virtual method	Delphi 2009
TObject.UnitName method	Delphi 2009
Touch support	Delphi 2010
TRegistry supports access flags	Delphi 6
TRegistry.OpenKeyReadOnly method	Delphi 4
TryStrToXXXX routines added to SysUtils	Delphi 6
TStream supports 64 bit size and seek offsets	Delphi 6
TStringList.Create(OwnsObjects: Boolean) constructor overload	Delphi 2009
Types unit	Delphi 6
UInt8 type	Delphi 2009
UInt16 type	Delphi 2009
UInt32 type	Delphi 2009
UInt64 type	Delphi 7
Unicode identifier names	Delphi 2005
Unicode source files	Delphi 2005
Unicode support (inc Windows API)	Delphi 2009
UnicodeString type	Delphi 2009
Unit conversion handling (that's unit as in mm or inches, not unit as in source code unit)	Delphi 6
Unit scope names [More info]. See also: Namespaces.	Delphi XE2
UTF8 source files	Delphi 2005
UTF8Decode and UTF8Encode routines	Delphi 6
UTF8String type	Delphi 6
Variants unit	Delphi 6
PosEx introduced	Delphi 7
PosEx became obsolete. Pos got third offset argument	Delphi XE3
Variants unit	Delphi 6
VCL styles	Delphi XE2
XMLDoc documentation	Delphi 2005
Multiline String Literals	Delphi 12 Athens

Footnotes

1. All this information relates to the native Delphi compiler, not the .NET compiler.
2. From Delphi XE5 the use of the {$IFEND} directive results in a compiler error unless a {$LEGACYIFEND} directive precedes the first {$IFEND} directive or unless the use of legacy {$IFEND} is enabled in project options.
3. Source: EFG's Computer Lab (defunct website). This source also stated that the Math unit did not change from Delphi 4 to Delphi 5.

Former source: delphiDabbler.com

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Embarcadero Delphi 10.4 does not support Windows 7. Delphi 10.3 still does.

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RAD Studio 12 offers official support for iOS 17 (for Delphi only), Android 14, and macOS Sonoma. RAD Studio 12 also supports Ubuntu 22 LTS and Windows Server 2022.